I collected over 14 lists of the Best TV Shows 2019 from the Internet, magazines and newspapers and combined them into one meta-list.  Here are the results: all the shows (including long-running series and miniseries) on three or more of the original source lists, organized by rank (that is, with the TV shows on the most lists at the top).

On 14 lists
Fleabag (Amazon)

On 11 lists
Succession (HBO)
Russian Doll (Netflix)

On 9 lists
Watchmen (HBO)

On 8 lists
When They See Us (Netflix)

On 7 lists
Unbelievable (Netflix)
Better Things (FX)
Pen15 (Hulu)

On 6 lists
Documentary Now! (IFC)
Tuca & Bertie (Netflix)
Undone (Amazon)
Barry (HBO)

On 4 lists
A Black Lady Sketch Show (HBO)
BoJack Horseman (Netflix)
Broad City (Comedy Central)
Chernobyl (HBO)
Euphoria (HBO)
Los Espookys (HBO)
Catastrophe (Amazon)

On 3 lists
Sherman’s Showcase (IFC)
The Other Two (Comedy Central)
Dickinson (Apple)
Lodge 49 (AMC)
The Good Fight (CBS All Access)
Big Mouth (Netflix)
The Good Place (NBC)
Back to Life (Showtime)
Veep (HBO)

Ramy (Hulu)